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December’s full moon will soon reach peak illumination. Here’s what to know

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The long night moon will reach peak illumination at 4:02 a.m. ET Sunday , according to The Old Farmer’s Almanac .

The December full moon occurs one week before the winter solstice, an astronomical event caused by Earth 's tilt.

For those in the Northern Hemisphere , the moon will appear for a shorter time and will follow a lower arch in the sky.